I am not sure that I ever actually had a worst teacher, well I should say that the worst of my teachers has never really been that bad. That said my least favorite teacher ever, would probably have to have been my English 3 Honors teacher (but I am SO glad that I had her because the AP English teacher was a confirmed *****, who actually made her students work really hard). But basically, this teacher, whose name I cannot even remember (except that her last name started with an S,) didn't know anything about educating, creating assignments, grading assignments, and teaching in general, the entire class pretty much held this in consensus, and most of us, were smarter than her, which says a lot considering the demographics for the class were pretty normal.
Thinking back I actually had a lot of fun in that class (someone in the class ordered pizza in her name one day, and one of my friends was ALWAYS ripping on her, he really made her look incredibly stupid every chance he got and would often just sit in class and read his own books to piss her off), but I still hate that teacher with a passion simply because of her utter lack of basic intelligence (and assuming air that life experience made her somehow superior to us), I guess I do feel a little sorry for her now that I am not thinking through the eyes of a high school student anymore, but she was not fit to be a teacher of even the simplest classes.
Like I said though, the class did not suck, the teacher just did. So I don't really care about it since I already knew all the material in that class anyways, because high school English is like the same exact thing every single year.